Q1. Fill in the blanks.

                          i.        Synthetic fibres are also called ___________or _____________fibres.

                         ii.        Synthetic fibres are synthesised from raw material called __________________.

                        iii.        Like synthetic fibres, plastic is also a _____________.

                        iv.        ______________is a popular polyester.

                         v.        _____________is made of many repeating units.

 

Q2. True/False

                           i.        Thermoplastics can bent easily. ________

                          ii.        Polymers are made up of many bigger units. ________

                         iii.        PET is a very familiar form of polyester. _________

                         iv.        Polyester fabrics do not get wrinkled easily. _________

                          v.        Fabric obtained from silk fibre is very cheap. _________

                         vi.        Fabric made from polyester fibre does not get wrinkled easily. ______

 

Q3. Name the plastic whose sheets are used for packing liquids.

 

Q4. Name one naturally occurring polymer.

 

Q5. Name the fibre used for making parachutes and ropes for rock climbing.

 

Q6. Which synthetic fiber is known as artificial silk?

 

Q7. Which is the first fully synthetic fibre?

 

Q8. Write one disadvantage of synthetic fibre.

 

Q9. What are esters?

 

Q10. What are the 4 R in waste management?

Or

What are the 4 R's principles of plastic?

 

Q11. What are the advantages of nylon?

 

Q12. Write uses of bakelite.

 

Q13. Write uses of melamine.

 

Q14. How is rayon different from synthetic fibres?

 

Q15. Give examples which indicate that nylon fibres are very strong.

 

Q16. What is polythene?

 

Q17. Is plastic bag non-biodegradable? Why?

 

Q18. Can we store jams and pickles in plastic containers? Give reason.

 

Q19. Do all plastics have same type of arrangement of units?

 

Q20. Why nylon is called fully synthetic fibre?

 

Q21. What is polyester?

 

Q22. Write one use of acrylic.

 

Last modified: Sunday, 23 June 2019, 9:27 AM